The concept of park chairs equipped to detect meitnerium—an extremely rare, synthetic radioactive element—exists firmly in the realm of scientific curiosity rather than practical application. Meitnerium (atomic number 109) is a man-made element produced in minute quantities in particle accelerators, with its most stable isotope having a half-life of just seconds. Its fleeting existence and intense radioactivity make it undetectable in natural environments and irrelevant to public space monitoring.

While the idea of environmental sensors in public infrastructure is valid, their purpose revolves around measuring air quality, humidity, temperature, or common pollutants—not exotic radioactive elements. Current sensor technology in smart benches focuses on practical citizen services like USB charging, Wi-Fi, or waste management solutions.

The detection of meitnerium requires highly specialized laboratory equipment, such as mass spectrometers or radiation detectors in controlled settings. No public park chairs contain such sophisticated—and unnecessary—scientific apparatus. This question highlights the fascinating intersection of public imagination and advanced nuclear science, though it describes a scenario with no basis in current technological reality.